Conduit Body Fill Calculator
Use this conduit body fill workflow when conductor area and manufacturer or verified capacity are already known. It does not reproduce conduit-body tables.
- Total conductor area
- sq in
- Required area
- sq in
- Fill percent
- %
- Spare area
- sq in
Calculation details
- Capacity status
- Calculation basis
- Selection boundary
Recent results
Formulas
- Total conductor area = area per conductor x conductor count
- Required area = total conductor area + splice or device allowance
- Fill percent = required area / entered conduit body capacity x 100
- Spare area = entered conduit body capacity - required area
Use this calculator
Estimate required area, fill percent, spare area, and capacity status from entered conductor area, conductor count, splice/device allowance, and conduit body capacity.
Read the result
Review the calculated values with their displayed units and assumptions. The result is a planning aid for the stated inputs, not a final equipment or installation decision.
Check before final work
This conduit body fill estimate depends on user-entered area and capacity values. It does not replace manufacturer markings, listing instructions, splice/device rules, or code compliance review.
FAQs
Does this look up conduit body capacity?
No. Enter the capacity from manufacturer marking, product data, or a verified project source.
Can this approve conduit body fill?
No. It is an entered-value screening calculation. Listing, manufacturer instructions, conductor details, splices, and code rules still need review.
What should I enter for area per conductor?
Use a verified conductor or cable area value that matches the exact product and installation basis you are screening.